html {
    scroll-behavior: smooth;
}
ul {
    --linewidth: 2px;
    margin: 0;
    padding: 0 0 0 2em;
    list-style-type: none;
    position: relative;
}
ul::before {
    content:"";
    display: block;
    bottom: 1em;
    top: .5em;
    position: absolute;
    left: calc(2em - 1.5px);
    border-left: var(--linewidth) solid #000;
}
li {
    padding-left: .5em;
    line-height: 1;
    margin-bottom: .5em;
    position: relative;
}
li a::before {
    content: "";
    display: block;
    position: absolute;
    left: 0;
    background: white;
    width: 6px;
    height: 6px;
    top: .5em;
    transform: translate(calc(-50% - var(--linewidth) / 2), -50%);
    border-radius: 100%;
    border: 2px solid black;
}
body {
    display: grid;
    grid-template-columns: repeat(12, 1fr);
}
ul {
    align-self: flex-start;
    grid-column: 1/span 2;
    position: sticky;
    top: 1em;
}
.content {
    grid-column: 3/span 9;   
    font-size: 2em;

}